From: John Max Skaller <skaller@ozemail.com.au>
To: Pierre Weis <pierre.weis@inria.fr>
Cc: warplayer@free.fr, garrigue@kurims.kyoto-u.ac.jp, caml-list@inria.fr
Subject: Re: [Caml-list] about Obj.magic
Date: Mon, 03 Jun 2002 01:15:46 +1000 [thread overview]
Message-ID: <3CFA36A2.1020408@ozemail.com.au> (raw)
In-Reply-To: <200206011742.TAA16993@pauillac.inria.fr>
Pierre Weis wrote:
>>An 'almost legal' use of Obj.magic is to populate an array with dummy
>>values.
>>For example:
>>
>> class Deep ..
>> let a = Array.make 100 (Obj.magic 0 :> Deep) in
>> let len_a = ref 0 in
>>
>>This is roughly as safe as an unsafe array access,
>>only now the array length is a variable.
>>
>>--
>>John Max Skaller, mailto:skaller@ozemail.com.au
>>snail:10/1 Toxteth Rd, Glebe, NSW 2037, Australia.
>>voice:61-2-9660-0850
>>
>
>I'm afraid that this use is not ``almost legal'' and, on the contrary,
>it is strongly discouraged by good programming practice!
>
And I'm sorry too, because it is the only way to achieve the desired effect:
Ocaml could do well with a variable length array in the standard
library, IMHO.
--
John Max Skaller, mailto:skaller@ozemail.com.au
snail:10/1 Toxteth Rd, Glebe, NSW 2037, Australia.
voice:61-2-9660-0850
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next prev parent reply other threads:[~2002-06-02 15:16 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-30 21:09 dengping zhu
2002-05-30 22:38 ` Jacques Garrigue
2002-05-31 4:00 ` Daniel de Rauglaudre
2002-05-31 5:37 ` Oleg
2002-05-31 6:17 ` Daniel de Rauglaudre
[not found] ` <p05100300b91cea02dbf5@[192.168.1.22]>
2002-05-31 9:50 ` [Caml-list] SML->OCaml (was: about Obj.magic) Daniel de Rauglaudre
2002-05-31 15:39 ` [Caml-list] about Obj.magic dengping zhu
2002-05-31 16:28 ` John D. Barnett
2002-06-01 8:37 ` Jacques Garrigue
2002-06-01 16:00 ` dengping zhu
2002-06-01 17:20 ` Pierre Weis
2002-05-31 9:17 ` Warp
2002-05-31 13:58 ` Jacques Garrigue
2002-05-31 14:06 ` Warp
2002-05-31 18:21 ` John Max Skaller
2002-06-01 17:42 ` Pierre Weis
2002-06-02 15:15 ` John Max Skaller [this message]
[not found] ` <D37FA3E3-763B-11D6-BE8F-0003938819CE@inria.fr>
2002-06-04 10:22 ` Pierre Weis
2002-05-31 14:10 ` Remi VANICAT
2002-05-31 16:19 ` Christophe TROESTLER
2002-05-31 18:06 ` Olivier Andrieu
2002-05-31 22:03 ` Christophe TROESTLER
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